Water heater



May 1, 1928.

C. H. MORROW WATER HEATER Filed Feb.5, 1927 Patented May 1, 1928.

UNITED: STATES PATENT 1 OFFICE.

CLARENCE H. MORROW, OF CLEVELAND, OHIO, ASSIGNOR TO THE HOTSTBEAM HEATER COMPANY, OF CLEVELAND, OHIO, A. CORPORATION OF OHIO.

WATER HEATER.

Application filed February 5, 1927. Serial No. 166,163;

Thisinvention relates to heaters such as hot water heaters for domestic use, of the type in which a coil of high therinoconductivity is arranged to circulate water to be heated, in a casing surrounding the coil and in which is circulated the heating medium, such as water at a higher temperature or steam; and the invention has particular reference to a design of such a heater which shall be of rugged and inexpensive construction, easily assembled, installed, operated and inspected; at particular object beingto provide a means for securing the terminals of the heating coil within the casing in a manner simpleand yet insuring against any leakage, and another particular object being to provide a means of draining the casing when desired, and of securing a cover there on to seal the same.

The exact nature ofthe invention together with further objects and advantages thereof will be apparent from the following description taken in connection with the accompanying drawings in which Fig. 1 is an elevation of a heating unit constructed according to my invention; Fig. 2 is a vertical section through the same in the plane of line 2-2, Fig. 1; Fig. 3 is a bottom view of the heater as appearing in Fig. 1; and Fig. 4 is.

a sectional detail showing in larger scale the exact manner in which the coil is secured water tight in the casing.

The principal parts of the heater are the casing 1; within which is positioned a. tubular member through which the water to be heated may be circulated, this member in the drawing appearing as a helical coil 2; and a cover 3 closing the open end of the casing. The casing is preferably of the cylindrical form shown provided axially with a. rod 41 terminating at its lower end in a threaded connection with an acorn nut 5, and threaded at its upper end to fit the flanged cover 3 which may thus be secured upon the casing; the rod being first secured at its lower end by the acorn nut and thereafter the cover 3 turned u n the upper end of the rod until it fits tightly against the gasket 6.

Therod 4 is easily inserted from above through the coils of the tubular member 2 and the hole 16 in the bottom of the casing, the inner edge ofthe hole being chamiered as indicated to assist in this operation. Upon removal of the rod, the hole 16 serves to drain the casing.

At the top of the casing is a lateral opening 7 threaded to receive an inlet pipe for steam or whatever heating medium is used and at the bottom. of the casing is a similar opening 8 into which an outlet pipe 9 maybe threaded, the heating medium such as steam being thus circulated through the casing.

At the upper end of the casing is an opening 10 and at the bottom a similar opening 11; as shown in Fig. 3 the outer portions of these openings are threaded toreceive the parallel pipes 1 1. and 15 through which the liquid to be heated is circulated; The inner portions of these openings 10 and 11 are cylindrical bores as indicated and medially of each of the openings are concentric enlarged portions 12, 13, tapers being provided at the junction of the cylindrical portions of the openings and the enlarged portions.

The coil 2 is preferably of copper or other nonferrous metal, and is of the helical form indicated, the terminal portions of the coil being brought out tangentially as indicated in a manner corresponding to the arrangement of the openings 10 and 11.

The diameter of the coil 2 and the length of the tangential terminating portions thereof are proportioned so that the coil may be inserted in the open end of the casing, the ends of the coil. clearing the bosses surrounding the openings 10 and 11 during this insertion; thereafter the coil terminals being thrust by lateral bodily movement of the coil, through the inner cylindrical portions of theopenings. 7

According to my invention, after this has been done av water tight connection is effected bet-ween the terminals of the coil and their respective openings in the casin by first swaging out the extreme ends 0 the coil to fit the tapering portions indicated and thus secure the ends from withdrawal and thereafter expanding the coil terminals outwardly against their surrounding cylindrical portions in the casing. Thus a metal to metal contact is obtained which has been found to bean effective water tight joint. This joint is unaffected as to efliciency, by temperature changes in service, the material of the coil being of higher co-efiicient of expansion than that of the casing which is commonly of cast iron, so that as the temperature rises the joint between the coil and the casing will become all the more tight.

What I claim is:

1. In a water heater, :1 generally cylindrical casing, a generally helical tubular member concentrically positioned within said casing, connections between the ends of said tubular member and said casing, an axial opening in one end of said casing, a cover upon the other end thereof, and a rod removably positioned in said opening to close the same and in removable connection with said cover to secure the same.

2. In a water heater, a generally cylindrical casing, a generally helical tubular member concentrically positioned within said casing, connections between the ends of said tubular member and said casing, an axial opening in one end of said casing, a cover upon the other end thereof, and a rod extending between said opening and said cover to close said opening and secure said cover.

3. In a water heater, a generally cylindrical casing, a generally helical tubular member concentrically positioned within said casing, connections between the ends of said tubular member and said casing, an axial opening in one end of said casing, a cover upon the other end thereof, a rod positioned in said opening, said rod being pro vided with a head member seating outside of said opening, and extending through said vasing' axially thereof to threaded connection with said cover.

4. In a water heater, a generally cylindrical casing. a generally helical tubular member concentrically positioned within said casing, ,-onnections between the ends of said tubular member and said casing, an axial opening in one end of said casing, a cover upon the other end thereof, and a rod removably positioned in said opening to close the same and in ren'iovable connection with said cover to secure the same, said opening); being provided at its inward extremity with a champl'er adapted to guide said rod in insertion therethrongh and to as ist in drainage through said opening.

in testimony whereof I hereby affix my signature.

CLARENCE H. MORROW. 

